When the battery is completely flat, it might take up to 40 minutes to even show the red charging light if changing from USB. So:
1) Connect USB and make sure to disable computer's auto sleep/off function. Then wait a couple of hours.
or,
2) Get a PSP charger (available pretty much everywhere) and charge using the round yellow socket. Charger doesn't have to be brand name Sony, any clone will do.
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